[Codename Milan] std::forward ignore namespaces in variadic template functions

[Codename Milan] std::forward ignore namespaces in variadic template functions by Raphael Londeix

Closed

as Fixed

Type:	Bug
ID:	775016
Opened:	12/22/2012 6:32:14 AM
Access Restriction:	Public

Workaround(s)

view

User(s) can reproduce this bug

The type name namespaces are totally ignored, and the compiler report that it does not know about the final type name.

Details (expand)

Visual Studio 2012

/* compile with cl.exe /EHsc test.cpp */

#include <utility>

namespace foo
{
    struct Bar
    {};
}

template<typename... Args>
void _print(Args&&... args)
{
}

template<typename... Args>
void print(Args&&... args)
{
    _print(std::forward<Args>(args)...);
}

int main()
{
    print(foo::Bar());
}

English

Windows 7

English

> cl /EHsc test.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 17.00.51025 for x64
Copyright (C) Microsoft Corporation. All rights reserved.

test.cpp
test.cpp(17) : error C2065: 'Bar' : undeclared identifier
        test.cpp(22) : see reference to function template instantiation 'void print<foo::Bar>(foo::Bar &&)' being compiled
test.cpp(17) : error C2974: 'std::forward' : invalid template argument for '_Ty', type expected
        C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\INCLUDE\type_traits(1780) : see declaration of 'std::forward'
        C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\INCLUDE\type_traits(1774) : see declaration of 'std::forward'

working compilation

0 attachments

Posted by Microsoft on 12/28/2012 at 12:22 PM

Hi Raphael:
Thanks for reporting the issue.
A fix for this issue has been checked into the compiler sources. The fix should show up in the next release of Visual C++.

Xiang Fan
Visual C++ Team

Posted by Microsoft on 12/23/2012 at 9:59 PM

Thank you for submitting feedback on Visual Studio and .NET Framework. Your issue has been routed to the appropriate VS development team for investigation. We will contact you if we require any additional information.

Posted by Microsoft on 12/22/2012 at 6:52 AM

Thank you for your feedback, we are currently reviewing the issue you have submitted. If this issue is urgent, please contact support directly(http://support.microsoft.com)